create table babel_404_vu_prepare_t1 (
    a int,
    b int,
    c int,
    d int,
    constraint pk primary key(
            a asc,
            b desc,
            c desc
    ),
    unique (
        a desc,
        b desc,
        d desc
    )
);
go

alter table babel_404_vu_prepare_t1 add constraint new_constr unique (
    a desc,
    b asc,
    c desc,
    d desc
)
go
--
insert into babel_404_vu_prepare_t1 values (1, 1, 1, 1);
insert into babel_404_vu_prepare_t1 values (1, 2, 1, 1);
insert into babel_404_vu_prepare_t1 values (1, 3, 1, 1);
insert into babel_404_vu_prepare_t1 values (1, 1, 2, 2);
insert into babel_404_vu_prepare_t1 values (1, 2, 2, 2);
go